Palladium-catalyzed Suzuki–Miyaura coupling of amides by carbon–nitrogen cleavage: general strategy for amide N–C bond activation
作者:Guangrong Meng、Michal Szostak
DOI:10.1039/c6ob00084c
日期:——
limitations are presented in the synthesis of >60 functionalized ketones. Mechanistic studies provide insight into the catalytic cycle of the cross-coupling, including the first experimental evidence for Pd insertion into the amide N–C bond. The synthetic utility is showcased by a gram-scale cross-coupling and cross-coupling at room temperature. Most importantly, this process provides a blueprint for the
[EN] 1, 3-DISUBSTITUTED AZETIDINE DERIVATIVES FOR USE AS CCR-3 RECEPTOR ANTAGONISTS IN THE TREATMENT OF INFLAMMATORY AND ALLERGIC DISEASES<br/>[FR] DERIVES D'AZETIDINE 1, 3-DISUBSTITUES A UTILISER EN TANT QU'ANTAGONISTES DU RECEPTEUR CCR3 DANS LE TRAITEMENT DE MALADIES INFLAMMATOIRES ET ALLERGIQUES
申请人:NOVARTIS AG
公开号:WO2005026113A1
公开(公告)日:2005-03-24
Compounds of formula Ia or Ib in free or salt form, wherein Ar, X1, X2, m, R1, Q, Y, R2 and R3 have the meanings as indicated in the specification, are useful for treating conditions that are mediated by CCR-3, for example an inflammatory or allergic condition, particularly an inflammatory or obstructive airways disease. Pharmaceutical compositions that contain the compounds and a process for preparing the compounds are also described.
abundant alkyl esters to afford amide bonds with exquisite selectivity by acyl C-O bond cleavage. The utility of this process is showcased by a broad scope of the method, including various sensitive functional groups, late-stage modification and the synthesis of drug molecules (>80 examples). Remarkable selectivity towards different functional groups and within different amide and ester electrophiles
酰胺键是化学和生物学中最基本的官能团之一,在许多简化关键药物和工业分子合成的过程中发挥着核心作用。尽管酰胺的合成是学术和工业科学家最常进行的反应之一,但由于该过程不利的动力学和热力学贡献,叔酰胺的直接转酰胺具有挑战性。在此,我们报告了第一种通用的、温和的和高度化学选择性的方法,用于通过非亲核胺的直接酰基 NC 键裂解对未活化的叔酰胺进行转酰胺。这种操作简单的方法是在没有过渡金属的情况下进行的,并且在异常温和的反应条件下进行。在这种情况下,我们进一步描述了大量烷基酯的直接酰胺化,以通过酰基 CO 键裂解提供具有极好的选择性的酰胺键。该方法的广泛应用展示了该过程的实用性,包括各种敏感的官能团、后期修饰和药物分子的合成(> 80 个例子)。观察到对不同官能团以及不同酰胺和酯亲电试剂的显着选择性,这是使用现有方法不可行的。进行了广泛的实验和计算研究,以深入了解高选择性的机制和起源。我们进一步提出了
Chemoselective Ketone Synthesis by the Addition of Organometallics to <i>N</i>-Acylazetidines
作者:Chengwei Liu、Marcel Achtenhagen、Michal Szostak
DOI:10.1021/acs.orglett.6b00842
日期:2016.5.20
A general and highly chemoselective method for the synthesis of ketones by the addition of organometallics to N-acylazetidines via stable tetrahedral intermediates is reported for the first time. The transformation is characterized by its wide substrate scope and exquisite selectivity for the ketone products even when a large excess of nucleophilicreagents is used. Even of broader interest is the
We report that the nucleophilic acyl substitution reaction of aliphatic and (hetero)aromaticamides by organolithium reagents proceeds quickly (20 s reaction time), efficiently, and chemoselectively with a broad substrate scope in the environmentally responsible cyclopentyl methyl ether, at ambient temperature and under air, to provide ketones in up to 93 % yield with an effective suppression of the